diff --git a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
index 386741c878..ea7ffe7e77 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
+++ b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
@@ -16,6 +16,7 @@ CHANGELOG
  * Added tag `routing.expression_language_function` to define functions available in route conditions
  * Added `debug:container --deprecations` option to see compile-time deprecations.
  * Made `BrowserKitAssertionsTrait` report the original error message in case of a failure
+ * Added ability for `config:dump-reference` and `debug:config` to dump and debug kernel container extension configuration.
 
 5.0.0
 -----
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php
index 175e0fae30..9caefac32f 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php
@@ -16,6 +16,7 @@ use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\Console\Helper\Table;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\StyleInterface;
+use Symfony\Component\DependencyInjection\Extension\ConfigurationExtensionInterface;
 use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 
 /**
@@ -64,6 +65,22 @@ abstract class AbstractConfigCommand extends ContainerDebugCommand
         $bundles = $this->initializeBundles();
         $minScore = INF;
 
+        $kernel = $this->getApplication()->getKernel();
+        if ($kernel instanceof ExtensionInterface && ($kernel instanceof ConfigurationInterface || $kernel instanceof ConfigurationExtensionInterface)) {
+            if ($name === $kernel->getAlias()) {
+                return $kernel;
+            }
+
+            if ($kernel->getAlias()) {
+                $distance = levenshtein($name, $kernel->getAlias());
+
+                if ($distance < $minScore) {
+                    $guess = $kernel->getAlias();
+                    $minScore = $distance;
+                }
+            }
+        }
+
         foreach ($bundles as $bundle) {
             if ($name === $bundle->getName()) {
                 if (!$bundle->getContainerExtension()) {
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php
index ef4d0fb51a..c68f17e120 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDebugCommand.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Command;
 
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Console\Exception\LogicException;
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
@@ -18,6 +19,8 @@ use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\DependencyInjection\Compiler\ValidateEnvPlaceholdersPass;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\ConfigurationExtensionInterface;
+use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 use Symfony\Component\Yaml\Yaml;
 
 /**
@@ -70,6 +73,15 @@ EOF
 
         if (null === $name = $input->getArgument('name')) {
             $this->listBundles($errorIo);
+
+            $kernel = $this->getApplication()->getKernel();
+            if ($kernel instanceof ExtensionInterface
+                && ($kernel instanceof ConfigurationInterface || $kernel instanceof ConfigurationExtensionInterface)
+                && $kernel->getAlias()
+            ) {
+                $errorIo->table(['Kernel Extension'], [[$kernel->getAlias()]]);
+            }
+
             $errorIo->comment('Provide the name of a bundle as the first argument of this command to dump its configuration. (e.g. <comment>debug:config FrameworkBundle</comment>)');
             $errorIo->comment('For dumping a specific option, add its path as the second argument of this command. (e.g. <comment>debug:config FrameworkBundle serializer</comment> to dump the <comment>framework.serializer</comment> configuration)');
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
index 60445e4063..4c9d0e62d7 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
@@ -11,6 +11,7 @@
 
 namespace Symfony\Bundle\FrameworkBundle\Command;
 
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Definition\Dumper\XmlReferenceDumper;
 use Symfony\Component\Config\Definition\Dumper\YamlReferenceDumper;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
@@ -19,6 +20,8 @@ use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
+use Symfony\Component\DependencyInjection\Extension\ConfigurationExtensionInterface;
+use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 
 /**
  * A console command for dumping available configuration reference.
@@ -81,6 +84,15 @@ EOF
 
         if (null === $name = $input->getArgument('name')) {
             $this->listBundles($errorIo);
+
+            $kernel = $this->getApplication()->getKernel();
+            if ($kernel instanceof ExtensionInterface
+                && ($kernel instanceof ConfigurationInterface || $kernel instanceof ConfigurationExtensionInterface)
+                && $kernel->getAlias()
+            ) {
+                $errorIo->table(['Kernel Extension'], [[$kernel->getAlias()]]);
+            }
+
             $errorIo->comment([
                 'Provide the name of a bundle as the first argument of this command to dump its default configuration. (e.g. <comment>config:dump-reference FrameworkBundle</comment>)',
                 'For dumping a specific option, add its path as the second argument of this command. (e.g. <comment>config:dump-reference FrameworkBundle profiler.matcher</comment> to dump the <comment>framework.profiler.matcher</comment> configuration)',
@@ -91,7 +103,11 @@ EOF
 
         $extension = $this->findExtension($name);
 
-        $configuration = $extension->getConfiguration([], $this->getContainerBuilder());
+        if ($extension instanceof ConfigurationInterface) {
+            $configuration = $extension;
+        } else {
+            $configuration = $extension->getConfiguration([], $this->getContainerBuilder());
+        }
 
         $this->validateConfiguration($extension, $configuration);
 
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ConfigDumpReferenceCommandTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ConfigDumpReferenceCommandTest.php
index f4298ac9a8..2a9b05d701 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ConfigDumpReferenceCommandTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/ConfigDumpReferenceCommandTest.php
@@ -30,6 +30,14 @@ class ConfigDumpReferenceCommandTest extends AbstractWebTestCase
         $this->application->doRun(new ArrayInput([]), new NullOutput());
     }
 
+    public function testDumpKernelExtension()
+    {
+        $tester = $this->createCommandTester();
+        $ret = $tester->execute(['name' => 'foo']);
+        $this->assertStringContainsString('foo:', $tester->getDisplay());
+        $this->assertStringContainsString('    bar', $tester->getDisplay());
+    }
+
     public function testDumpBundleName()
     {
         $tester = $this->createCommandTester();
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AppKernel.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AppKernel.php
index c6675c3b1a..2199560ac8 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AppKernel.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Functional/app/AppKernel.php
@@ -12,9 +12,12 @@
 namespace Symfony\Bundle\FrameworkBundle\Tests\Functional\app;
 
 use Psr\Log\NullLogger;
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\HttpKernel\Kernel;
 
@@ -23,7 +26,7 @@ use Symfony\Component\HttpKernel\Kernel;
  *
  * @author Johannes M. Schmitt <schmittjoh@gmail.com>
  */
-class AppKernel extends Kernel
+class AppKernel extends Kernel implements ExtensionInterface, ConfigurationInterface
 {
     private $varDir;
     private $testCase;
@@ -106,4 +109,32 @@ class AppKernel extends Kernel
 
         return parent::getContainer();
     }
+
+    public function getConfigTreeBuilder()
+    {
+        $treeBuilder = new TreeBuilder('foo');
+        $rootNode = $treeBuilder->getRootNode();
+        $rootNode->children()->scalarNode('foo')->defaultValue('bar')->end()->end();
+
+        return $treeBuilder;
+    }
+
+    public function load(array $configs, ContainerBuilder $container)
+    {
+    }
+
+    public function getNamespace()
+    {
+        return '';
+    }
+
+    public function getXsdValidationBasePath()
+    {
+        return false;
+    }
+
+    public function getAlias()
+    {
+        return 'foo';
+    }
 }
diff --git a/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php b/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
index 1045991ded..dcfd0f7257 100644
--- a/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
+++ b/src/Symfony/Component/DependencyInjection/Compiler/ValidateEnvPlaceholdersPass.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\DependencyInjection\Compiler;
 
 use Symfony\Component\Config\Definition\BaseNode;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
 use Symfony\Component\Config\Definition\Processor;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\ConfigurationExtensionInterface;
@@ -68,14 +69,18 @@ class ValidateEnvPlaceholdersPass implements CompilerPassInterface
             $processor = new Processor();
 
             foreach ($extensions as $name => $extension) {
-                if (!$extension instanceof ConfigurationExtensionInterface || !$config = array_filter($container->getExtensionConfig($name))) {
+                if (!($extension instanceof ConfigurationExtensionInterface || $extension instanceof ConfigurationInterface)
+                    || !$config = array_filter($container->getExtensionConfig($name))
+                ) {
                     // this extension has no semantic configuration or was not called
                     continue;
                 }
 
                 $config = $resolvingBag->resolveValue($config);
 
-                if (null === $configuration = $extension->getConfiguration($config, $container)) {
+                if ($extension instanceof ConfigurationInterface) {
+                    $configuration = $extension;
+                } elseif (null === $configuration = $extension->getConfiguration($config, $container)) {
                     continue;
                 }